How the difference from the appearance of brushless dc motor with a dc motor
brushless dc motor with a brush with very similar in shape, shape, not distinguish carefully, is likely to go wrong. So what is difference from the appearance of brushless dc motor or a dc motor? Small make up teach you several recruit:
a: look at the appearance, usually flat brushless dc motor (Small power also have round)And a dc motor length is greater than the diameter.
way 2: motor lead wire, brushless dc motor rotor on don't need an external power supply, so there is no lead; And a dc motor is the need and power, so there are two power cord, lead wire on the stator is don't see the difference.
3: view structure, open motor, saw the carbon brush is a dc motor, otherwise is a brushless dc motor.
pattern 4: check the nameplate, general manufacturers will be in the motor nameplate marking each parameter values, has a brush dc motor and brushless dc motor and the said model is different, can be respectively from it. If some brushless motor said BLD models beginning of letters, and brushless dc motor is DK has said.
in addition to the above a few from the appearance on the difference between the two ways, we can also through some actual operation to further confirm the difference. For example:
a: generating method of test, using pointer multimeter on dc motor power supply cord, multimeter to adjust to low voltage, slowly turn the motor shaft with the hand, if the pointer still can speed up the rotation, the pointer is brushless dc motor, on the other hand is a brushless dc motor.
2: to observe the continuous working time, relative to a brush motor, brushless dc motor of huizhou continuous working time will be longer, because of the brushless motor is not need to change the carbon brush,And brush motor carbon brush in use after a period of time will wear, need to change to normal use. So the two large difference in the continuous working time. But beware: the length of the continuous working time is not on behalf of the service life of the motor! Theory of continuous working time is long, life is not necessarily the motor long! Brushless motor and motor, it depends on the service life of motor internal main components of the weak part of the normal use of time. For example, if the winding brushless motor manufacturing process quality, poor quality of materials, rough, so bad motor is a brushless motor, first, not a brush motor.
as a result, in addition to knowing how to distinguish between brush, brushless dc motor is still have to know how to choose the high quality of the motor. High quality of the motor to ensure it has a longer service life. ,
